
In this study, we applied FNDMC to
investigate the basis-set dependence of
the linearization energy of a disiloxane molecule in
comparison with other ab initio methods including DFT and CCSD(T), as well as
empirical measurements from earlier studies conducted on disiloxane [1]}, [2]}, [3]}.
The FNDMC depends on the basis set implicitly through its fixed nodal surface
provided by the Slater determinant whose orbitals are expanded
in terms of the basis set,
whereas DFT and CCSD(T) strongly depend on the choice of basis set.
The cc-pV\(x\) Z [4]}, [5]}, [6]} and
cc-pCV\(x\) Z [7]} basis sets (\(x =\)  D, T, Q), which are
standard correlation methods,
were examined in the present study and then applied
to all the ab initio calculations
to investigate the basis-set dependence of linearisation energy evaluation.
